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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