How do you solve these with the substitution method? 4x - y = -14 y = 8x + 7 4x - (8x + 7) = -14 {substituted 8x + 7, in for y,into top equation} 4x - 8x - 7 = -14 {distributed negative sign through parentheses} -4x - 7 = -14 {combined like terms} -4x = -7 {added 7 to both sides} x = 7/4 {divided both sides by -4} y = 8x + 7 {bottom original equation} y = 8(7/4) + 7 {substituted 7/4, in for x, into bottom equation} y = 14 + 7 {cancelled and multiplied} y = 21 {added} x = 7/4 and y = 21 © Algebra House
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