Use addition or substitution to

Can someone please help solve this?Solve by using addition or substitution or addition. 10x+2y=7 y=-5x+3 the answer my got was
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Polymers are formed by ________________ .Question 21 options: a) condensation reactions only b) addition reactions only c) both
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What is the value of x? Justify each step.AC=32 2x 6x+8 .__________________._________________. A B C Drawing not to scale AB +
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What is the value of x? Justify each step.AC=32 2x 6x+8 .__________________._________________. A B C Drawing not to scale AB +
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10x - 12 = 68A Transitive Property B Multiplication Property C Addition Property D Simplify E Angle Addition Postulate F
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8x - 12 + 2x = 68A Transitive Property B Multiplication Property C Addition Property D Simplify E Angle Addition Postulate F
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EF + FG = EGA Transitive Property B Multiplication Property C Addition Property D Simplify E Angle Addition Postulate F
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x = 8A Transitive Property B Multiplication Property C Addition Property D Simplify E Angle Addition Postulate F Substitution
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x = 8A Transitive Property B Multiplication Property C Addition Property D Simplify E Angle Addition Postulate F Substitution
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10x = 80A Transitive Property B Multiplication Property C Addition Property D Simplify E Angle Addition Postulate F Substitution
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